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Assembly time cut
PRODUCTION
Assembly time cut An ultrasonic plastics welding unit is helping to save assembly time in the production of miniature indicator lights. The manufacturers of the lights, Thorn-Bendix, are using a Kerry ‘Plastison’ J-3 system for two assembly operationsstaking and remote welding. A small moulded nylon component with two projections moulded into position has a copper contact (a two part or a single component assembly) over the projection moulded component. The welding system is employed to form the protruding part into shape so that it will secure the copper contact in position. In staking, this is achieved by the forming tool remaining cold, while the movement of the tip at ultrasonic frequency locally melts and reforms the plastics into the shape of the cavity, ensuring a positive assembly. In the second operation, a two-part moulding is assembled by the welding action of the ultrasonic horn. The operation does not require the use of sonic energy along the total length of a joint to complete the seal. Alternative methods of assembly using adhesives would not only be difficult to apply, but the application would be timeconsuming, messy and most probably hazardous because of toxicity and inflammability. Thorn-Bendix
Limited, Enfield, Middlesex, UK
Kerry Ultrasonics Limited, Hunting Gate, Wilbury Way, Hitchin, Hertfordshire, UK
Fig.1
Ultrasonic
cleaning of blanks for proof coins
minute cleaning cycle from which the blanks emerge warm, clean and dry. The Royal Mint, Tower Hill, London EC3, UK ICI, Thames House North, Millbank, London SWIP 4QG, UK
Clean as a new penny The Royal Mint are using an ultrasonic blanks for proof coins.
cleaning plant to clean
Previously, all cleaning was done by hand, tion of an automatic buffing machine and increased production meant that a quicker efficient cleaning method had to be found. stage 600 W, 25 kHz ICI cleaner, the ULV solvent, ‘Arklone’ P, were chosen.
but the installathe need for and more A three149, and an ICI
The ultrasonic cleaning plant ensured that the blanks (Fig.1) were perfectly clean and free from residual buffing compound and that excessive temperatures, which could affect some of the alloys used in coin production, were not applied. The blanks after buffing are loaded into specially designed carriers to prevent surface damage, and then immersed in the three compartments of the plant in turn. The first rough cleaning is done in boiling solvent at 47°C and is followed by ultrasonic treatment in cool solvent. The final rinse in pure solvent vapour completes the three
ULTRASONICS.
JULY 1972
Errata A. Piotrowska, ‘Propagation of ultrasonic waves in suspensions and emulsions: 2. Relation between ultrasonic properties and certain characteristics of the medium.’ ULTRASONICS October 197 1 pp 235-239 Page 236 Right co1
Line 30
Delete: Using the expression
Page 237 Left co1
Line 11
Read: 17% instead of 10%
Page 238 Left co1 Right co1 Right co1
Line 11 Line 9 Line 20
Read: but it instead of Now f’ (k) Read: organic instead of inorganic Read: flZ instead of 0,
Page 239 Right co1
Ref 10
Read: Vo169 instead of Vol59; 1956 instead of 1953
149
Assembly time cut An ultrasonic plastics welding unit is helping to save assembly time in the production of miniature indicator lights. The manufacturers of the lights, Thorn-Bendix, are using a Kerry ‘Plastison’ J-3 system for two assembly operationsstaking and remote welding. A small moulded nylon component with two projections moulded into position has a copper contact (a two part or a single component assembly) over the projection moulded component. The welding system is employed to form the protruding part into shape so that it will secure the copper contact in position. In staking, this is achieved by the forming tool remaining cold, while the movement of the tip at ultrasonic frequency locally melts and reforms the plastics into the shape of the cavity, ensuring a positive assembly. In the second operation, a two-part moulding is assembled by the welding action of the ultrasonic horn. The operation does not require the use of sonic energy along the total length of a joint to complete the seal. Alternative methods of assembly using adhesives would not only be difficult to apply, but the application would be timeconsuming, messy and most probably hazardous because of toxicity and inflammability. Thorn-Bendix
Limited, Enfield, Middlesex, UK
Kerry Ultrasonics Limited, Hunting Gate, Wilbury Way, Hitchin, Hertfordshire, UK
Fig.1
Ultrasonic
cleaning of blanks for proof coins
minute cleaning cycle from which the blanks emerge warm, clean and dry. The Royal Mint, Tower Hill, London EC3, UK ICI, Thames House North, Millbank, London SWIP 4QG, UK
Clean as a new penny The Royal Mint are using an ultrasonic blanks for proof coins.
cleaning plant to clean
Previously, all cleaning was done by hand, tion of an automatic buffing machine and increased production meant that a quicker efficient cleaning method had to be found. stage 600 W, 25 kHz ICI cleaner, the ULV solvent, ‘Arklone’ P, were chosen.
but the installathe need for and more A three149, and an ICI
The ultrasonic cleaning plant ensured that the blanks (Fig.1) were perfectly clean and free from residual buffing compound and that excessive temperatures, which could affect some of the alloys used in coin production, were not applied. The blanks after buffing are loaded into specially designed carriers to prevent surface damage, and then immersed in the three compartments of the plant in turn. The first rough cleaning is done in boiling solvent at 47°C and is followed by ultrasonic treatment in cool solvent. The final rinse in pure solvent vapour completes the three
ULTRASONICS.
JULY 1972
Errata A. Piotrowska, ‘Propagation of ultrasonic waves in suspensions and emulsions: 2. Relation between ultrasonic properties and certain characteristics of the medium.’ ULTRASONICS October 197 1 pp 235-239 Page 236 Right co1
Line 30
Delete: Using the expression
Page 237 Left co1
Line 11
Read: 17% instead of 10%
Page 238 Left co1 Right co1 Right co1
Line 11 Line 9 Line 20
Read: but it instead of Now f’ (k) Read: organic instead of inorganic Read: flZ instead of 0,
Page 239 Right co1
Ref 10
Read: Vo169 instead of Vol59; 1956 instead of 1953
149